Availability of soil nitrogen released from pea and lentil residue to subsequent cereal crops under reduced tillage
Adderley, D.R., Schoenau, J.J. and Holm, F.A. 1998. In Soils and Crops Workshop Proc., pp. 339-344. Univ. Saskatchewan.
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The release of N from legume crop residues in the field can potentially be an important nutrient source for succeeding cereal crops, particularly in soils which are N deficient. Field studies were conducted in 1996 on two soils of contrasting textures in the Dark Brown soil zone of Saskatchewan, a 1) Sutherland clay loam (Kernen), and a 2) Bradwell sandy loam (Goodale), which were previously cropped to pea and lentil in order to compare the effects of legume stubble type on soil N supply. Spring wheat was direct seeded in 1997 in order to compare yields and crop N uptake on pea and lentil stubble. Pre-seeding soil samples were taken and analyzed for NH4 and NO3. Pre-seeding available N amounts were significantly greater at Kernen, corresponding to higher organic matter levels. Supply rates of NO3 during the growing season were measured using anion exchange resin membrane (PRS™-probes). Higher overall supply rates were measured at Kernen as compared to Goodale, while significantly greater supply rates on pea stubble were observed at Goodale only. Both wheat yield and N uptake were significantly greater at Kernen as a function of higher N availability. Mean N uptake and yields were generally higher under pea stubble than lentil at both sites but not significantly different at the 10% level.